// Download older version app from iTunes server
// 使用 Brook 下载任意 iOS App 的旧版本
//
// Replace the values of appid and versionid to yours.
//
// https://www.txthinking.com/talks/articles/ios-old-version-app.article
// https://www.txthinking.com/talks/articles/ios-old-version-app-en.article

appid := "544007664" // YouTube
versionid := "848374799" // v17.15.1

text := import("text")
f := func(){
    if in_dnsquery {
        // block secure dns
        if in_dnsquery.domain == "dns.google" {
            return {block: true}
        }
    }
    if in_address {
        m := in_address
        if m.ipaddress {
            // block secure dns
            if m.ipaddress == "8.8.8.8:853" || m.ipaddress == "8.8.8.8:443" || m.ipaddress == "8.8.4.4:853" || m.ipaddress == "8.8.4.4:443" || m.ipaddress == "[2001:4860:4860::8888]:853" || m.ipaddress == "[2001:4860:4860::8888]:443" || m.ipaddress == "[2001:4860:4860::8844]:853" || m.ipaddress == "[2001:4860:4860::8844]:443" {
                return { "block": true }
            }
        }
        if m.domainaddress {
            // block secure dns
            if text.has_prefix(m.domainaddress, "dns.google:") {
                return { "block": true }
            }
            if text.has_suffix(m.domainaddress, "-buy.itunes.apple.com:443") {
                return {
                     mitm:true,
                     mitmprotocol: "https",
                     mitmwithbody: true,
                     mitmautohandlecompress: true
                }
            }
        }
        return
    }
    if in_httprequest && !in_httpresponse {
        if in_httprequest["Method"] == "POST" && text.contains(in_httprequest["URL"], "/WebObjects/MZBuy.woa/wa/buyProduct") {
            s := string(in_httprequest["Body"])
            if text.contains(s, "<string>"+appid+"</string>") {
                in_httprequest["Body"] = bytes(text.re_replace(`<key>appExtVrsId</key>\s*<string>\d+</string>`, s, "<key>appExtVrsId</key>\n<string>"+versionid+"</string>"))
            }
        }
        return in_httprequest
    }
    if in_httprequest && in_httpresponse {
        return in_httpresponse
    }
}
out := f()